Radium compound and process of making same.



UNITED @TATES PATN oxFioE.

JOHANNES REITZ, or SOHMARGENDORF, NEAR BERLIN, GERMANY, Assienon TO THEFIRM or PAUL srMoN, or PLAUEN, GERMANY.

nuroiucoi/rroonn am) rnocnss or menus as.

Specification of Letters Patent.

Patented May 4, 1909.

application filed September 20, 1907. lSeria'l No. 393,862

To all whom it may concern:

Be it known that I, JoHANNEs Rnrrz a subject of the King of Prussia,German Em-' tion of a radio-active salt in the form of a densecrystalline mass.

' It has already been proposed to precipitate radium in solution withanother substance, but in thiscase the resulting product was a granularmass which soon lost its radio active qualities or these became so faintas to become useless for application. for medical and other purposes.due to the fact, that the proportions of neither the carrying substancenor the radium could be controlled in a mere precipitation.

The object of .the present invention is to produce an improved and novelcombination ofa radium compoundby means of which the proportions of theradium and the crystalline mass binding said medium can be determinedwith accuracy beforehand. According to the present invention a suitablecarrying salt is first calcined or deprived of its crystalline water orof as much of its crystalline Water as desired and this crystallinewater is substituted by an aqueous solution of a radium compound. Theresulting prodnot therefore is a radio-active crystal having acrystallizing salt and an aqueous solution of a radium compound formingall or a part of the crystallizing water.

The invention is carried out as follows: In the-first place an aqueoussolution of a radium compound is produced. Then a crystallizingsubstance is taken, of which the water contained therein is expelled bya priorproceeding, such as calcination for instance, whereby thecrystallizing substance is reduced to a friable state or a powder.. Acertain guantity of this powderis taken and mine with a certain quantityof the radiumcompound solution, the proportion of the two ingredientsbein' such that the Whole solution is thoroug y taken up and bound bythe powder. The quantity flsolution bound This was principally.

by the crystallizing substance is somewhat less than the quantity offluid matter expelled from said substance by its prior treatment, sothat the end product gained is a very solid and dense crystalline masswhich is capable of withstanding any atmospheric influence. vantage ofthe finished preparation and allows the same to be stored for aconsiderable time without fear of a gradual decay or disintegration ofthe mass. Moreover I have found that if a radio-active substance isbound in the manner described, the emanae tions become greater in courseof'time, a phenomenon probably due to the dense structure of thecrystalline mass binding the radiumcompound.

In order to make my mvention more clear,

I shall give a specific instance of the preparation of a radiumincasement according to my IIIVBIIHOII'.

Carbonate of-sodium 1s first calcined;

This calcined product is then mixed with an aqueous solution of a radiumcompound in the following proportions: To 1 milligram of bromid ofradium (RaBr dissolved in 1000 cu. cm. of water, 1000 grams of calcinedcarbonate of sodium are added. Such a mixture forms'a white crystallinemasssuitable for internal ap' plic-ation'for medical purposes and at thesame time retains the radio-activity of the radium bromid and preventsits conversion into helium. The radio-active sub stance according to thepresent invention .may be applied internally as a medicine.

Claims.

1. Apermanent radioactive crystalline product derived from a radium saltsolution and an anhydrous crystalline substance which product forms auniform crystalline mass and has theproperty of retaining theradioactivity of the radium therein and avoiding the conversion ofsaidradium into helium. Q v

2. A permanent radio-active crystalline This results in the practicaladproduct derived from a bromid or radium solution and anhydrous sodiumcarbonate which-product forms a white crystalline mass suitable forinternal application for med1cal,purpo se s and at the same time retainsthe radio-activity of the radium bro mid therein and avoids itsconversion '1l1t0 helium.

3. Process for, the production of a permanent radio-active crystallinesubstance crystallization therefrom and mixing the substance thustreated with an aqueous s0- lution of a r'adiuin compound the propoi.tion of the solution added being such that its amount is less than thewater )reviously 10 expelled from said crystallizing suhstanee.

In witness whereof I. have hereunto set my hand in the presence of twowitnesses.

JOHANNES REITZ.

Witnesses V HENRY IIASPER, WOLDEMAR .HAUPT.

